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E46 (1999 - 2006) The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

Well that's not entirely true. If you put the car into first gear in steptronic mode, it will stay in gear all the way until redline. At that point it will be forced to upshift into 2nd gear. This will probably yield the fastest time accelerations.

(Also I believe if you floor the pedal, you will actually feel a button sort of click as the pedal hits the end of travel, which will prompt the car to accelerate at it's best???).

Regardless, whichever technique yields the fastest 0-60 times was probably used when they measured the 0-60 time in the first place.

Well that's not entirely true. If you put the car into first gear in steptronic mode, it will stay in gear all the way until redline. At that point it will be forced to upshift into 2nd gear. This will probably yield the fastest time accelerations.

(Also I believe if you floor the pedal, you will actually feel a button sort of click as the pedal hits the end of travel, which will prompt the car to accelerate at it's best???).

Regardless, whichever technique yields the fastest 0-60 times was probably used when they measured the 0-60 time in the first place.